3 Answers
3

This has been a matter discussed in Microsoft's Power Users Community within several threads. A concluding topic, save an email to a document library, sheds some light for how you may actually succeed with your requirement.

As using Flow's functionality to re-attach email's attachments to a new file seemingly just does not work, you can achieve the same results by using the Flow's Parserr (https://flow.microsoft.com/en-us/connectors/shared_parserr/parserr/). Parserr's primary function is to allow you to extract data from recurring incoming emails and email attachments.

Disclaimer: According to Parserr's own web site, their tools have also the billable versions besides the Free version. The Free version has some strict limitations with e.g. max 10 documents/mail attachments per month. I'm not associated with this product in any manner.

Parserr has a ready template to be used with SharePoint in here: Extract data from a new email and create a new item in SharePoint. This template, according to the site, has been used only 22 times as of today, and is a notably new addition, so not too much existing documentation will be available to assist on how the template shall be used.